Fig. 3
From: Enhancing anticipation control of the posture system in the elderly wearing stroboscopic glasses
Procedure flowchart to calculate phase–amplitude coupling (PAC) between postural fluctuations and scalp EEG. The phase component of the postural fluctuations is extracted using the Hilbert transform. The scalp EEG at the C4 electrode is conditioned with a band-pass filter to isolate sub-band EEG signals (theta: 4–7 Hz, alpha: 8–12 Hz, and beta: 13–35 Hz). The cortico-posture interaction between low-frequency postural fluctuations (< 4 Hz) and high-frequency EEG at C4 is characterized using band-specific PAC. The PAC between postural fluctuations and sub-band EEG across eighteen bins is displayed at the bottom of the plot. The divergence between the observed distribution of phase-amplitude relationships (MIobserved) is normalized with respect to a reference uniform distribution (MIshuffled) across the eighteen bins, resulting in ZMI